Update Plugin Metrics to R7

Greetings,

MCStats / Plugin Metrics recently updated to R7, changelog available [here](http://forums.bukkit.org/threads/mcstats-plugin-metrics-r7-easy-advanced-plugin-statistics.77352/page-7#post-1729198).

Vault is one of the plugins I picked to update manually to test (mainly because I knew it uses maven). I've tested this and it is sending data correctly on the new version as expected as seen below.

![](http://puu.sh/3r42w.png)